1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Helper for knfsd's SSC to access ops in NFS client modules 4 * 5 * Author: Dai Ngo <dai.ngo@oracle.com> 6 * 7 * Copyright (c) 2020, Oracle and/or its affiliates. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/fs.h> 12 #include <linux/nfs_ssc.h> 13 #include "../nfs/nfs4_fs.h" 14 15 MODULE_LICENSE("GPL"); 16 17 struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl; 18 EXPORT_SYMBOL_GPL(nfs_ssc_client_tbl); 19 20 #ifdef CONFIG_NFS_V4_2 21 /** 22 * nfs42_ssc_register - install the NFS_V4 client ops in the nfs_ssc_client_tbl 23 * @ops: NFS_V4 ops to be installed 24 * 25 * Return values: 26 * None 27 */ 28 void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops) 29 { 30 nfs_ssc_client_tbl.ssc_nfs4_ops = ops; 31 } 32 EXPORT_SYMBOL_GPL(nfs42_ssc_register); 33 34 /** 35 * nfs42_ssc_unregister - uninstall the NFS_V4 client ops from 36 * the nfs_ssc_client_tbl 37 * @ops: ops to be uninstalled 38 * 39 * Return values: 40 * None 41 */ 42 void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops) 43 { 44 if (nfs_ssc_client_tbl.ssc_nfs4_ops != ops) 45 return; 46 47 nfs_ssc_client_tbl.ssc_nfs4_ops = NULL; 48 } 49 EXPORT_SYMBOL_GPL(nfs42_ssc_unregister); 50 #endif /* CONFIG_NFS_V4_2 */ 51 52 #ifdef CONFIG_NFS_V4_2 53 /** 54 * nfs_ssc_register - install the NFS_FS client ops in the nfs_ssc_client_tbl 55 * @ops: NFS_FS ops to be installed 56 * 57 * Return values: 58 * None 59 */ 60 void nfs_ssc_register(const struct nfs_ssc_client_ops *ops) 61 { 62 nfs_ssc_client_tbl.ssc_nfs_ops = ops; 63 } 64 EXPORT_SYMBOL_GPL(nfs_ssc_register); 65 66 /** 67 * nfs_ssc_unregister - uninstall the NFS_FS client ops from 68 * the nfs_ssc_client_tbl 69 * @ops: ops to be uninstalled 70 * 71 * Return values: 72 * None 73 */ 74 void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops) 75 { 76 if (nfs_ssc_client_tbl.ssc_nfs_ops != ops) 77 return; 78 nfs_ssc_client_tbl.ssc_nfs_ops = NULL; 79 } 80 EXPORT_SYMBOL_GPL(nfs_ssc_unregister); 81 82 #else 83 void nfs_ssc_register(const struct nfs_ssc_client_ops *ops) 84 { 85 } 86 EXPORT_SYMBOL_GPL(nfs_ssc_register); 87 88 void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops) 89 { 90 } 91 EXPORT_SYMBOL_GPL(nfs_ssc_unregister); 92 #endif /* CONFIG_NFS_V4_2 */ 93